<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel='stylesheet' href='http://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css'>
    <style>
        body {
            background-image: url("../img/huanying.png");
        }
    </style>
</head>
<body>

</body>
</html>